package com.unknowpupil.design.observer;


/**
 * @Description: <p>
 * 观察者接口
 * </p>
 * @Author: <a> w10g </a>
 * @CreateDate: Create in 2020/4/28 16:26
 * @Classname: Observer
 * @Version: 1.0
 */
public interface Observer {

    void update(Subject subject);
}
